HTRA1, an age-related macular degeneration protease, processes extracellular matrix proteins EFEMP1 and TSP1.

HTRA1, an age-related macular degeneration protease, processes extracellular matrix proteins EFEMP1 and TSP1.
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HTRA1 是一种与年龄相关的黄斑变性蛋白酶,可处理细胞外基质蛋白 EFEMP1 和 TSP1

DOI:
10.1111/acel.12710
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发表时间:
2018-08
期刊:
影响因子:
7.8
通讯作者:
Tsang SH
Tsang SH
中科院分区:
生物学1区
文献类型:
--
作者:
Lin MK;Yang J;Hsu CW;Gore A;Bassuk AG;Brown LM;Colligan R;Sengillo JD;Mahajan VB;Tsang SH

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高温需要蛋白A1(HTRA 1)是一种丝氨酸蛋白酶,由包括视网膜色素上皮(RPE)在内的许多组织分泌。编码HTRA 1的基因的启动子变体是突变等位基因的一部分,该突变等位基因导致HTRA 1表达增加,并在全基因组关联研究中导致年龄相关性黄斑变性(AMD)。AMD的特征在于玻璃疣的病理发展、蛋白质和脂质在RPE基底侧的细胞外沉积。AMD的分子发病机制尚未完全了解,了解细胞外基质的失调可能是关键。我们通过蛋白质组学比较有和没有突变的RPE细胞的蛋白质水平来评估10 q26的高风险基因型。我们发现HTRA 1蛋白水平在高危RPE细胞中与几种细胞外基质蛋白一起增加,包括已知的HTRA 1切割靶点LTBP-1和clusterin。此外,已经确定了HTRA 1的两个新靶点:EFEMP 1,一种在Doyne蜂窝状视网膜营养不良(一种类似于AMD的遗传性眼病)中突变的细胞外基质蛋白,以及血小板反应蛋白1(TSP 1),一种血管生成抑制剂。我们的数据支持RPE细胞外沉积在渗出性AMD中对新血管形成屏障受损具有潜在影响的作用。
High‐temperature requirement protein A1 (HTRA1) is a serine protease secreted by a number of tissues including retinal pigment epithelium (RPE). A promoter variant of the gene encoding HTRA1 is part of a mutant allele that causes increased HTRA1 expression and contributed to age‐related macular degeneration (AMD) in genomewide association studies. AMD is characterized by pathological development of drusen, extracellular deposits of proteins and lipids on the basal side of RPE. The molecular pathogenesis of AMD is not well understood, and understanding dysregulation of the extracellular matrix may be key. We assess the high‐risk genotype at 10q26 by proteomic comparison of protein levels of RPE cells with and without the mutation. We show HTRA1 protein level is increased in high‐risk RPE cells along with several extracellular matrix proteins, including known HTRA1 cleavage targets LTBP‐1 and clusterin. In addition, two novel targets of HTRA1 have been identified: EFEMP1, an extracellular matrix protein mutated in Doyne honeycomb retinal dystrophy, a genetic eye disease similar to AMD, and thrombospondin 1 (TSP1), an inhibitor of angiogenesis. Our data support the role of RPE extracellular deposition with potential effects in compromised barrier to neovascularization in exudative AMD.
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